Duct connecting device

ABSTRACT

This invention relates to a duct connecting device in a duct collecting equipment for a coke oven wherein a substantially perfect sealing is made by utilizing the weight of a lid and the negative pressure within a fixed duct, the ventilating resistance when the connecting port is opened is made very low, the cost is low and troubles are few.

United States Patent Ibaragi et al.

[451 July 29, 1975 DUCT CONNECTING DEVICE Inventors: Tetsuo lbaragi; Keishi Yamamoto; Yasuhiko Noda, all of Wakayama, Japan Assignee: Sumikin Coke Company Limited,

Wakayama, Japan Filed: Feb. 12, 1973 Appl. No.: 331,446

Foreign Application Priority Data Nov. 6, 1972 Japan .51. 47-127780[U] Nov. 8, 1972 Japan 47-128650[U] Feb. 10, l972 Japan 47-16885[U] U.S. Cl 202/263; 202/255 Int. Cl Cl0b 31/06 Field of Search 202/262, 263, 254-259;

References Cited UNITED STATES PATENTS Koppers 201/39 3,036,720 5/1962 Malkomes 202/262 3,613,913 10/l97l Knappstein 3,647,636 3/1972 Helm 3,729,384 4/1973 Kinzler et al. 3,801,473 4/1974 Schoen et al. 202/227 X FOREIGN PATENTS OR APPLICATIONS 60,735 3/1968 Germany 202/263 Primary ExaminerNorman Yudkoff Assistant ExaminerD. H. Sanders Attorney, Agent, or FirmMarkva & Smith [5 7] ABSTRACT This invention relates to a duct connecting device in a duct collecting equipment for a coke oven wherein a substantially perfect sealing is made by utilizing the weight of a lid and the negative pressure within a fixed duct, the ventilating resistance when the connecting port is opened is made very low, the cost is low and troubles are few.

2 Claims, 11 Drawing Figures PATENTEUJULZBISYS 3, 897, 313

main 1 JU 9 PNtNTEB L2 3,897,313

FIG. 4

m @JW/Z mm PATENTED JUL29I975 PATENTED JUL 2 91975 SHEET 6 F I G. 7

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H I! ll I I 72 73 TI 72 RATE N150 JUL 2 9197s SHEE? DUCT CONNECTING DEVICE This invention relates to a duct connecting device in a dust collecting apparatus for dust-containing gases generated when a coke oven is charged with coal or when the coking of coal in the coke oven is finished and the red incandescent hot coke product is discharged out of the coke oven.

The coke oven consists of many arranged oven chambers so that coal may be put into these oven chambers and coked to produce coke and coal gases. In order to charge such coke oven with coal, coal is put into a coal chamber of a charging car moving along the top of the coke oven, is moved onto the oven chamber to be charged with the coal and is put into the oven chamber through a charging port provided at the top of the oven. In such case, gases accompanied with a large amount of coal dust will diffuse into the atmosphere through the charging port.

Further, in order to discharge red incandescent hot coke produced in the oven chamber, oven doors on both sides of the oven chamber are removed and the coke is pushed out of the oven chamber and is dropped into a quenching car through a coke guide. In such case, too, gases accompanied with'a large amount of coke dust will diffuse into the atmosphere.

Therefore, the working environment is very bad and the living environment around a coke producing plant is also polluted. Therefore, such dust-containing gases must be perfectly caught and must be cleaned by removing dust before being discharged into the atmosphere.

Therefore, a charging car is equipped with a dustcollecting hood, a fixed duct is arranged in parallel with a coke oven, a dust remover and exhauster are connected with the fixed duct and said fixed duct and dust collecting hood are made to communicate with each other through a duct connecting device so that gases accompanied with coal dust and generated when the coke oven chamber is charged with coal may be led into the dust remover through the dust collecting hood, duct connecting device and fixed duct to have dust removed and may be thus cleaned before being discharged into the atmosphere.

Also, in the case of discharging produced coke out of the oven chamber, a coke guide car is equipped with a dust collecting hood made to cover the quenching car from above, a fixed duct is arranged in parallel with the coke oven, a dust remover and exhauster 'are. connected with the fixed duct and the fixed duct and dust collecting hood are made to communicate with each other through a duct connecting device so that gases accompanied with coke dust and generatedwhen "the coke is discharged may be led into the dust remover through the dust collecting hooddust connecting device and fixed duct the have dust removed and may be thus cleaned before being discharged into the atmosphere. H

Several examples of the duct connecting device in such dust collecting apparatus have been already suggested. Some of them have been'practiced but have defects that the structure is so complicated that, in such environment accompanied with dust and heat as in a coke plant, there will be many troubles and a stabilized operation will be difficult, that the closure of the opening on the fixed duct side is so imperfect in the structure of the duct connecting device that much of the atmosphere will leak in, the suction of dust-containing gases will be insufficient and that the ventilating resistance in the duct connecting part is so high that the suction of dust-containing gases will be barred and the dust collecting effect will be low. a

For example, the duct connecting device shown in Japanese patent publication No. 30100/1971 is of a structure wherein a movable duct is made to communi- Cate with a dust collecting hood provided in a charging car or coke guide car so that, when this movable duct advances to push the lid of the connecting port part of a fixed duct into the fixed duct, thrusts into the fixed duct and then retreats, the connecting port of the fixed duct may be closed. However, it has defects that the ventilating resistance is high in the connecting part and that the lid of the connecting port utilizing a spring is not smooth to open and close and causes many troubles.

Further, Japanese patent publication No. 30102/1971 is of a duct connecting device wherein an opening is provided to be long in the axial direction of a duct on the wall surface of a fixed duct and an auxiliary duct provided in a dust collecting hood provided in a charging car or coke guide car is connected with a moving hood provided in the fixed duct through the above mentioned opening part so that the dust collecting hood, auxiliary duct, moving hood and fixed duct may be free to communicate with one another and the other opening parts are closed with a belt so that only the part in which the above mentioned auxiliary duct is positioned may open. However, it has not been practiced because the structure is complicated and the ventilating resistance of the connecting part is very high.

Further, suggested in Japanese utility model publication No. 34774/1972 is a duct connecting device wherein a moving nozzle (duct) is made to communicate with a dust collecting hood provided in a charging car or coke guide car, a pushing plate is fitted to the moving nozzle and a sealing damper is fitted to the connecting port part of a fixed duct so that, when the moving nozzle (duct) advances and the pushing plate pushes the sealing damper, said sealing damper may rotate to open the connecting port of the fixed duct.

However, it has a defedt that, when the sealing damper is closed, the leakage of the atmosphere into the fixed duct will be so high that the dust collecting hood communicating with the fixed duct will be able to well develop no dust collecting effect. Therefore, as shown in US. Pat. No. 3,767,536 to Ikeda et al., there is sugdefects are eliminated, the operation of opening and closing the connecting port of the duct is easy, the airtightness when the connecting port is closed is very high, the structure is simple, troubles are few and the cost is low.

In the drawings: FIG. Us a schematic view of a dust collecting device for dust-containing gases in a coke oven;

FIGS.'2 and 3 are schematic cross-sectioned views of conventional duct connecting ports;

FIG. 4 is a schematic plan' view of a dust collecting device showing an embodiment of the present invention;

FIG. is a side view of FIG. 4;

FIG. 6 is a sectioned side view of the part A in FIGS. 4 and 5;

FIG. 7 is a sectioned side view of the part B in FIGS. 4 and 5;

FIG. 8 is a sectioned side view of a duct connecting device provided with a moving duct which can advance toward the part above the upper wall of a fixed duct;

FIG. 9 is a sectioned view of a duct connecting port;

FIG. is a plan view of FIG. 9;

FIG. 1 1 is a magnified view of an essential part showing the edge part in FIGS. 9 and 10.

In a coke oven, when a coke oven chamber is charged with coal from a coal hopper in a charging car or red incandescent hot coke made by coking the coal is pushed out of the oven chamber and is mounted on a quenching car through a coke guide or is so-called discharged, gases accompanied with a large amount of coal dust or coke dust will diffuse into the atmosphere to deteriorate the working environment and to pollute the living environment around the coke producing plant. Therefore, such dust-containing gases must be cleaned by removing dust before being discharged into the atmosphere.

Therefore, as shown in FIG. 1, a fixed duct 2 is arranged in the end part of the top of a coke oven 1, a dust remover 3 and air exhauster 4 are connected with said fixed duct 2, each charging sleeve of a charging car 5 is provided with a dust collecting hood 6 and the above mentioned fixedduct 2 and dust collecting hood 6 are formed to be free to communicate with each other through a duct 7 and duct connecting device 8 so that, when an oven chamber 9 is charged with coal from a coal hopper 10 of the charging car 5, dustcontaining gases accompanied with coal dust diffused in the atmosphere through a coal charging port 11 may be caught by the dust collecting hood 6, may be sucked and led by the exhauster 4 into the dust remover 3 through the duct 7, connecting device 8 and fixed duct 2 and may be cleaned by removing dust before being discharged into the atmosphere through a delivery port in the exhauster 4. Or a fixed duct 12 is arranged along a coke oven battery, a dust remover 13 and air exhauster 14 are connected with the fixed duct 12, a coke guide car 15 is provided with a dust collecting hood 16 and the fixed duct 12 and dust collecting hood 16 are made free to communicate with each other through a duct connecting device 17 to that, when red incandescent hot coke is pushed out of the oven chamber 9 and is mounted on a quenching car 18, dust-containing gases accompanied with coke dust deposited on red incandescent hot coke blocks and coke dust generated by the dropping impact of red incandescent hot coke in a gas current produced by the high temperature of red incandescent hot coke may be caught by the dust collecting hood 16, may be sucked and led by the exhauster 14 into the dust remover 13 through the duct connecting device 17 and fixed duct 12 and may be cleaned by removing dust before being discharged into the atmosphere through a delivery port in the exhauster 14.

However, as the connecting devices provided in the fixed ducts 2 and 12 are provided with connecting ports corresponding to many oven chambers of the coke oven, unless these connecting ports are well sealed, the suction pressure will be reduced by the atmosphere leaking in through so many connecting ports as to be several tens or more than one hundred and the dustcontaining gases will not be well sucked.

Further, if the structure of the connecting device is complicated, troubles will be so many that no stabilized operation will be able to be expected. Therefore, the connecting device for the fixed duct and dust collecting hood is required to be of a simple structure wherein the operation of opening and closing the connecting ports is easy, the air-tightness is high, the equipment cost is low and troubles are few.

There has been suggested and practiced a fixed duct connecting device wherein, for example, as shown in FIG. 2, a connecting port 22 corresponding to each oven chamber of a coke oven is provided on the side surface of a fixed duct 21 and a sealing damper 23 is rotatably supported by a shaft 24 in this connecting port 22 and is engaged at the upper end and lower end respectively with stoppers 25a and 25b provided on the edge of the connecting port 22 so that, when a metal piece 26 provided at the forward end of a moving duct 27 communicating with a dust collecting hood advances into the connecting port 22, the sealing damper 23 will rotate and open around the shaft 24 as a center but, when the metal piece 26 retreats, the sealing damper 23 will close due to its own weight or, as shown in FIG. 3, a connecting port 32 corresponding to each of oven chambers of a coke oven is provided on the lower side of a fixed duct 31, a lid 34 closing the connecting port 32 is provided within the fixed duct 31 and is pressed by springs 33 so that, when a movable duct 36 communicating with a dust collecting hood thrusts into the fixed duct 31 through the connecting port 32, the lid 34 may rise against the resilience of the springs to open the connecting port 32 but, when the movable duct 36 retreats, the lid 34 may return onto the corir'iecting port 32 due to the resiliency of the spring 33 to close the connecting port 32. However, it can not well satisfy the above mentioned conditions.

"Ehe present invention is a duct connecting device wherein a fixed duct arranged in parallel with a coke oven battery is provided with a connecting port consisting of a lid receiving seat and a lid on the upper wall surface of the fixed duct in a dust collecting apparatus with which a dust remover and exhauster are connected so as to correspond to the oven chamber of a coke oven, an opening of a connecting duct communicating with the interior of a dust collecting hood is provided so as to be positioned above the upper wall of the fixed duct and an electromagnet to fix and remove the lid of the connecting port of the fixed duct is provided within the opening of the connecting duct.

It is effective to form the connecting port so that a laid receiving seat may be fitted to the peripheral edge of the opening an edge may be vertically secured along the inner periphery of the lid receiving seat and the connecting portlid may be mounted on said edge.

The details of the present invention shall be explained with reference to the drawings.

The case of discharging coke shall be first explained with reference to FIGS. 4, 5 and 6. Numeral 41 is a coke oven in which many oven chambers are arranged. Numeral 43 is a coke guide car, 44 is a coke guide fitted to the coke guide car and 45 is a quenching car to be used to mount and quench red incandescent hot coke. Numeral 46 is a dust collecting hood fitted to the coke guide car 43 so as to cover the part above the quenching car 45 and 47 is a fixed duct arranged in parallel with the coke oven 41 and having a dust remover 48 and exhauster 49 connected with it. Numeral 50 is a rail arranged on the upper end part of the fixed duct 47 and 51 is a connecting port provided on the upper wall surface of the fixed duct 47 so as to correspond to each of the oven chambers 42 and having a lid receiving seat 52 fitted to it. A lid 53 is made of a magnetic material and is so formed that the surface of the lid 53 may be flush with the surface of the upper wall of the fixed duct 47. Numeral 54 is a connecting duct communicating with the interior of the dust collecting hood 46 and provided so that a wheel 55 provided at the free end may be mounted on the rail 50 so as to support the connecting duct 54 at one end. Numeral 56 is an opening of the connecting duct 54 provided so as to be positioned above the upper wall surface of the fixed duct 47, 57 is a fluid cylinder fixed upright on the wall above the opening 56, 58 is a piston rod of the fluid cylinder 57 passing through the upper wall of the connecting duct and having an electromagnet 59 fitted to the free end within the connecting duct 54. Numeral 60 is sliding member made of a soft rubber material or a thick fabric and fitted to the peripheral edge of the opening 56 so as to close the clearance between the wall of the opening 56 and the upper wall surface of the fixed duct 47.

Its operation shall be explained in the following. When the coke guide car 43 moves to a fixed position of the oven chamber 42a out of which coke is to be discharged, the dust collecting hood fitted to the coke guide car 43 and the connecting duct 54 attached to it will move together with the coke guide car while being supported by the rail 50 and wheel 55 until the opening 56 of the connecting duct 54 occupies the position above the lid 53 of the connecting port of the fixed duct corresponding to the oven chamber 42a. Then, if the fluid cylinder 57 is then operated to move the piston rod downward and lower the electromagnet 59 at the free end of the piston rod onto the lid 53 and the electromagnet 59 is excited, the lid 53 will be attracted by the electromagnet 59. Then, if the fluid cylinder 57 is again operated to move the piston rod upward, the electromagnet 59 will rise while attaching the lid 53 as it is to open the connecting port of the fixed duct 47 and the interior of the dust collecting hood 46 and the interior of the fixed duct will communicate with each other. In such case, the clearance between the upper wall surface and the peripheral edge of the opening 56 will remain closed by the sliding member 60 so that no outside air may come in.

When the discharge of coke starts and red incandescent hot coke drops onto the quenching car 45 through the coke guide 44, a large amount of dust-containing gases generated thereby will be sucked by the exhauster 49 which has been started in advance through the dust collecting hood 46, connecting duct 54 and fixed duct 47, will be led into the dust remover 48, will be cleaned by removing dust and will be discharged into the atmosphere through the delivery port of the exhauster 49.

When the discharge of coke ends, the fluid cylinder 57 will be operated to lower the electromagnet 59 and mount the lid 53 on the connecting port 51 and the electromagnet will be demagnetized. Then, if the fluid cylinder 57 is operated to raise the electromagnet 59, the connecting port 51 will remain perfectly closed by the lid 53. Then the coke guide car 43 moves to the oven chamber out of which coke is to be discharged next.

Next, the coke producing operation shall be explained with reference to FIGS. 4, 5 and 7.

The charging operation by using the charging car is the same as in the above described discharge of coke. A charging car 63 is provided with a dust collecting hood 66 to cover the clearance between a charging port 65 and charging sleeve.

On the other hand, on the upper wall surface of a fixed duct 67 arranged on the upper end part of the oven so as to' be in parallel with the coke oven battery 41, a connecting port 71 formed of a lid receiving seat 72 and a lid 73 made of a magnetic material is provided to correspond to each of the oven chambers 42. An opening 76 of a connecting duct 74 communicating with the interior of a dust collecting hood 66 is so made as to be positioned above the upper wall surface of the above mentioned fixed duct 67. The connecting duct 74 is supported at one end with a wheel 75 provided in the free end part of the connecting duct 74 and a rail laid on the upper end part of the fixed duct 67.

A fluid cylinder 77 is fitted upright on the upper wall part of the above mentioned opening 76 and its piston rod 78 passes through the upper wall and moves vertically up and down within the opening 76. An electromagnet 79 is fitted to the free end of the piston rod 78. The clearance between the peripheral edge of the opening 76 and the fixed duct 67 is closed with the sliding member 80 fitted to the peripheral edge of the opening 76.

When the charging car 63 stops in a fixed position of the oven chamber 42a to be charged with coal, the opening 76 of the connecting duct 74 will be positioned above the connecting port corresponding to the oven chamber 42a of the fixed duct 67. Then, if the lid of the charging port 65 is opened and, simultaneously with or before or after lowering the charging sleeve and dust collecting hood 76 onto the charging port 65, the fluid cylinder 77 is operated to lower the electromagnet 79 onto the lid 73, the electromagnet 79 is excited and again the fluid cylinder 77 is operated to raise the electromagnet 79, the lid 73 of the connecting port 71 will rise as attracted to the electromagnet 79 as it is and therefore the interior of the dust collecting hood 66 and the interior of the fixed duct 67 will communicate with each other.

Then, if the charging is started, the dust-containing gases jetted out'through the charging port 65 will be sucked by the exhau'ster 69 which has been started in advance through the dust collecting hood 66, connecting duct 74 and fixed duct 67, will be led into the dust remover, will be cleaned by removing dust and will be discharged into. the atmosphere through the delivery port of the exhauster 69.

When the charging of the oven chamber with coal ends, the fluid cylinder 77 will be operated to lower the electromagnet 79, said electromagnet will be demagnetized and then the fluid cylinder 77 will be operated to raise the electromagnet 79. Thereby the lid 73 will be placed on the connecting port 71 to perfectly close the connecting port 71.

Then the charging sleeve and dust collecting hood 66 are raised and the lid is fitted to the charging port 71 to finish all the charging operation.

The connecting duct of the duct connecting device described above can be also formed so as to be movable to advance toward the following. wall surface of the fixed duct as in the folllowing.

If it is thus formed, for example. in case it is fitted to the charging car, it will be possible to eliminate such disadvantage that, in case the charging car deviates from the position of the fixed duct and moves below a coal tower, the connecting duct projecting above the upper wall surface of the fixed duct will collide with such obstacle as the wall of the coal tower.

FIG. 8 is of the above described movable connecting duct. In the drawing, numeral 87 is a duct communicating with a dust collecting hood (not illustrated) and numeral 88 is a fixed duct arranged on the end of the top of a coke oven so as to be parallel with the coke oven battery and having a dust remover and exhauster connected at one end. A connecting port is provided on the upper wall of the fixed duct 88 so as to correspond to each oven chamber and consists of a lid 90 and lid receiving seat 89. Numeral 91 is a rail laid on a charging car and provided so as to intersect at right angles with the axis of the fixed duct 88. A moving duct 92 is mounted on this rail 91 through wheels 93. Numeral 94 is an opening in the lower part of the free end of the moving duct 92 and 95 is a fluid cylinder fitted upright to the upper wall of the opening 94. The piston rod 96 of this fluid cylinder 95 passes through the upper wall of the opening 94 and suspends an electromagnet 97 within the opening. Numeral 98 is a sliding member fitted to the lower end of the peripheral edge of the above mentioned opening 94 so as to close the clearance between the upper wall surface of the fixed duct 88 and the peripheral edge of the opening 94. Numeral 99 is a fluid cylinder for advancing the moving duct 92 to ward the fixed duct 88. Numeral 100 is a piston rod of the fluid cylinder 99 connected at the free end with the lower part of the moving duct 92, 101 is an opening at the upper end of the rear part of the moving duct 92 and 102 is an opening at the lower end of the front part of the duct 87 so that, when the fluid cylinder 99 operates to advance the moving duct 92 toward the fixed duct 88 and the opening 94 arrives above the connecting port lid 90 of the fixed duct 88, the duct 87 and moving duct 92 may communicate with each other through the openings 101 and 102. Number 103 is a sliding member provided on the peripheral edge of the opening 102 so as to close the clearance between the lower end of the peripheral edge of the opening 102 and the peripheral edge of the opening 101.

In the case of charging the coke oven chamber with coal, when the fluid cylinder 99 is operated to advance the piston rod 100, the moving duct 92 will move on the rail 91 toward the fixed duct 88. When the opening 94 moves to be above the fixed duct 88 and is positioned above the lid 90 of the connecting port, the opening 102 will be placed above the opening 101 so that the duct 87 and moving duct 92 may communicate with each other. Then, if the fluid cylinder 95 is operated to lower the electromagnet 97 onto the lid 90, the electromagnet 97 is excited to attract the lid 90 and the fluid cylinder is again operated to raise the electromagnet 97, the lid 90 will rise together with the electromagnet and the fixed duct 88, moving duct 92 and duct 87 8 with the dust collecting hood will communicate with one another.

Therefore, when the charging of the oven chamber with coal is started, as the dust remover and exhauster connected with the fixed duct 88 have been started in advance, the generated dust-containing gases will be sucked by the dust remover from the dust collecting hood through the moving duct and fixed duct and will be cleaned.

When the charging with coal ends, the fluid cylinder 95 will be operated to lower the electromagnet 97, the lid attracted by the electromagnet 97 will be demagnetized. Then, if the fluid cylinder is operated to raise the electromagnet 97, the connecting port will be perfectly closed with the lid 90. Then, if the fluid cylinder 99 is operated to retreat the moving duct 92, even if the charging car moves freely to mount coal or for any other work below the coal tower, the connecting duct will not be likely to collide with any obstacle.

Further, the connecting port of the present invention is only to mount a lid plate on a lid receiving seat and has effects that the structure and operation are very simple and easy, that the fixed duct can be perfectly closed, that the equipment cost is low and that there is substantially no trouble. An example of the connecting port shall be described in the following. that is to say, as shown in FIGS. 9, l0 and 11, an opening is made in the upper wall of a fixed duct, a lid receiving seat 113 is fitted to the peripheral edge of this opening, an edge 114 is vertically secured along the inner periphery of the lid receiving seat 113 and a lid 115 is mounted on the above mentioned edge 114.

Further, numeral 116 is a guide frame provided on the lower surface of the lid 115 so as to serve to mount the lid 115 correctly on the edge 114.

In the case of sucking dust-containing gases, as the lid 115 is mounted on the connecting port not communicating with the dust collecting hood, the lid 115 will be pushed against the edge 114 by its own weight and the negative pressure within the fixed duct so that the connecting port may be sealed substantially perfectly. If the lid 115 is received by the edge of a surface body instead of the edge 114 on which the lid 115 is to be mounted, as dust-containing gases having a temperature at or above 200C. pass through the connecting port, due to deformations produced in the surface body or impurities bitten in, the connecting port will not be able to be perfectly closed.

Further, on the duct connecting device of the present invention, in the above mentioned explanation, the manner of opening and closing one connecting port has been described. Howevr, as required, the device can be so formed that two or more connecting ports may be made to simultaneously communicate with the dust collecting hood and thus there may be an effect of making the ventilation through the connecting port easier.

As describd above, the present invention is of a simple structure wherein, the order to catch dustcontaining gases generated in charging a coke oven with coal or discharging coke, the communication of a dust collecting hood provided in a guide car or charging car with a fixed duct with which a dust remover and exhauster are connected is attained by a simple operation of suspending up a lid of a connecting port with a fluid cylinder and electromagnet, the connecting port of the fixed duct is provided on the upper wall surface and the lid is only mounted on the connecting port and therefore the invention has such many advantages that there is substantially no trouble, that a nearly perfect sealing can be made by utilizing the weight of the lid and the negative pressure within the fixed duct and that the ventilating resistance when the connecting port is opened is so low that the equipment cost can be reduced.

What is claimed is:

l. A coke oven system comprising a. an elongated coke oven battery comprising a plurality of oven chambers each having at least one coal-charging port, a charging car adapted to travel along a path parallel to said coke oven battery and to be stopped at any one of said coal-charging ports and deliver coal to one of said oven chambers,

b. a dust-collecting hood mounted on said charging car for collecting dust laden gas passing through a charging port from an oven chamber while being charged with coal,

c. a stationary duct arranged parallel with said coke oven battery, said stationary duct having a substantially horizontally disposed upper wall and communicating with a dust-removal means,

d. a plurality of connecting ports extending along said upper wall of said stationary duct, each said port corresponding to a coal-charging port in said coke oven battery and including a seal and a lid mounted on said seat, said lid comprising a magnetic material,

e. a connecting duct extending from said collecting hood above said upper wall of said stationary duct, said connecting duct being arranged to travel with said charging car and said dust-collecting hood and along the length of said upper wall of said stationary duct,

f. a downwardly facing opening in said connecting duct arranged to communicate with one of said connecting ports when said charging car is stopped at one of said coal-charging ports, and

g. electromagnet means mounted within said connecting duct and arranged, when said connecting duct opening is in communication with one of said connecting ports, to engage the lid mounted on the seat at said one connecting port, raise said lid through said downwardly facing opening in said connecting port to a position in said connecting duct permitting passage of dust laden gases from said connecting duct, through said opening and connecting port into said stationary duct, and return said lid to said seat before said charging car moves to another coal-charging port.

2. A coke oven system according to claim 1 further comprising:

a. a coke guide car adapted to travel along a path parallel to said coke oven battery and to be stopped at any one of said oven chambers to receive coke from said one chamber,

b. a second dust-collecting hood mounted on said coke guide car for collecting dust laden gas from said coke received in said coke guide car from said oven chamber,

. a second stationary duct arranged parallel with said coke oven battery, said second stationary duct having a substantially horizontally disposed upper wall and communicating with a dust-removal means,

. a plurality of connecting ports extending along said upper wall of said second stationary duct, each said port corresponding to an oven chamber in said coke oven battery and including a seat and a lid mounted on said seat, said lid comprising a magnetic material,

. a second connecting duct extending from said second collecting hood above said upper wall of said second stationary duct, said second connecting duct being arranged to travel with said coke guide car and said second dust-collecting hood and along the length of said upper wall of said second stationary duct,

. a downwardly facing opening in said second connecting duct arranged to communicate with one of said connecting ports when said coke guide car is stopped at one of said oven chambers, and

g. second electromagnet means mounted within said other oven chamber. 

1. A COKE OVEN SYSTEM COMPRISING A. AN ELONGATED COKE OVEN BATTERY COMPRISING A PLURALITY OF OVEN CHAMBERS EACH HAVING AT LEAST ONE COAL-CHARGING PORT, A CHARGING CAR ADAPTED TO TRAVEL ALONG A PATH PARALLEL TO SAID COKE OVEN BATTERY AND TO BE STOPPED AT ANY ONE OF SAID COAL-CHARGING PORTS AND DELIVER COAL TO ONE OF SAID OVEN CHAMBERS, B. A DUST-COLLECTING HOOD MOUNTED ON SAID CHARGING CAR FOR COLLECTING DUST LADEN GAS PASSING THROUGH A CHARGING PORT FROM AN OVEN CHAMBER WHILE BEING CHARGED WITH COAL, C. A STATIONARY DUCT ARRANGED PARALLEL WITH SAID COKE OVEN BATTERY, SAID STATIONARY DUCT HAVING A SUBSTANTIALLY HORIZONTALLY DISPOSED UPPER WALL AND COMMUNICATING WITH A DUST-REMOVAL MEANS, D. A PLURALITY OF CONNECTING PORTS EXTENDING ALONG SAID UPPER WALL OF SAID STATIONARY DUCT, EACH SAID PORT CORRESPONDING TO A COAL-CHARGING PORT IN SAID COKE OVEN BATTERY AND INCLUDING A SEAL AND A LID MOUNTED ON SAID SEAT, SAID LID COMPRISING A MAGNETIC MATERIAL, E. A CONNECTING DUCT EXTENDING FROM SAID COLLECTING HOOD ABOVE SAID UPPER WALL OF SAID STATIONARY DUCT, SAID CONNECTING DUCT BEING ARRANGED TO TRAVEL WITH SAID CHARGING CAR AND SAID DUST-COLLECTING HOOD AND ALONG THE LENGTH OF SAID UPPER WALL OF SAID STATIONARY DUCT, F. A DOWNWARDLY FACING OPENING IN SAID CONNECTING DUCT ARRANGED TO COMMUNICATE WITH ONE OF SAID CONNECTING PORTS WHEN SAID CHARGING CAR IS STOPPED AT ONE OF SAID COAL-CHARGING PORTS, AND G. ELECTROMAGNET MEANS MOUNTED WITHIN SAID CONNECTING DUCT AND ARRANGED, WHEN SAID CONNECTING DUCT OPENING IS IN COMMUNICATION WITH ONE OF SAID CONNECTING PORTS, TO ENGAGE THE LID MOUNTED ON THE SEAT AT SAID ONE CONNECTING PORT, RAISE SAID LID THROUGH SAID DOWNWARDLY FACING OPENING IN SAID CONNECTING PORT TO A POSITION IN SAID CONNECTING DUCT PERMITTING PASSAGE OF DUST LADEN GASES FROM SAID CONNECTING DUCT, THROUGH SAID OPENING AND CONNECTING PORT INTO SAID STATIONARY DUCT, AND RETURN SAID LID TO SAID SEAT BEFORE SAID CHARGING CAR MOVES TO ANOTHER COALCHARGING PORT.
 2. A coke oven system according to claim 1 further comprising: a. a coke guide car adapted to travel along a path parallel to said coke oven battery and to be stopped at any one of said oven chambers to receive coke from said one chamber, b. a second dust-collecting hood mounted on said coke guide car for collecting dust laden gas from said coke received in said coke guide car from said oven chamber, c. a second stationary duct arranged parallel with said coke oven battery, said second stationary duct having a substantially horizontally disposed upper wall and communicating with a dust-removal means, d. a plurality of connecting ports extending along said upper wall of said second stationary duct, each said port corresponding to an oven chamber in said coke oven battery and including a seat and a lid mounted on said seat, said lid comprising a magnetic material, e. a second connecting duct extending from said second collecting hood above said upper wall of said second stationary duct, said second connecting duct being arranged to travel with said coke guide car and said second dust-collecting hood and along the length of said upper wall of said second stationary duct, f. a downwardly facing opening in said second connecting duct arranged to communicate with one of said connecting ports when said coke guide car is stopped at one of said oven chambers, and g. second electromagnet means mounted within said second connecting duct and arranged, when said second connecting duct opening is in communication with one of said connecting ports, to engage the lid mounted on the seat at said one connecting port, raise said lid through said downwardly facing opening in said second connecting duct to a position in said connecting port permitting passage of dust-laden gases from said second connecting duct, through said opening and connecting port and into said second stationary duct, and return said lid to said seat before said coke guide car moves to another oven chamber. 